Liam w



(No Model I U. HULL 8v, W. W. MOEWAN. y HOT PRESSING MACHINE FOR PAPERPAILS.

No. 471,996. Patented Mar, 29, 1892..

' \Q l I a UZAL HULL AND WILLIAM WV. MOEWAN, OF BELVIDERE, NE\V JERSEY,A S- SIGNORS TO THE NEW YORK WOOD FIBRE COMPANY, OF SAMEPLAOE.

HOT- PRESSING MACHINE FOR PAPER PAILS.

SPECIFICATION forming part of Letters Patent No. 471,996, dated March29, 1892. Application filed September 17, 1890. Serial No. 365,267. (Nomodel.)

To an whom it may concern: ring I), of greater diameter than said die. ABe it known that we, UZAL HULL and WIL- series of springs c areinterposed between said LIAM W. MGEWAN, citizens of the United ring andthe under surface of the press-head,States,andresidentsofBelvidere,inthecounty their upper portions beingseated in sockets 5 of Warren and State of New Jersey, have inin thelatter. These springs have considervented certain new and usefulImprovements able power, but not enough to resist thepressinHot-Pressing MachinesforPaper Pails; and ore of the follower.Steam supply and exwe do declare the following to be a full, clear,haust pipes la and 70 lead into the chamber K and exact description ofthe invention, such of the die F, in order that this die may be {O aswill enable others skilled in the art to which heated.

it appertains to make and use the same, refer G represents the lowerdie, which is of ence being had to the accompanying drawsocket form, itsinterior correspondingin conings, and to letters of reference markedtheretour to the exterior form of the upper die. on, which form a partof this specification. The lower die is carried upon the upper face 1Figurelofthedrawingsisaside elevationof of the follower B, and isusually provided the device embodying ourinvention. Fig. 2 is with aspring-truck H, which moves upon a a vertical central section of thesame. Fig. 3 track f, with which said follower is provided. is a detailview showing the track for the The sustaining-barsof said truckaredesigned socket-die. to have some elasticity, in order to raise the 20This invention has relation to the manufaclower surface of thesocket-die a little above 1 ture of paper pails, tubs, &c.; and itconsists the upper surface of the follower when the in the constructionand novel combinations pressure is off, while allowing said follower toof devices for hot-pressing hereinafter set rise in contact with saidlower surface of the forth. In articles of this character it isessensocket-die when the pressing action is taking 2 5 tial that theypossess sufficient hardness and place.

density to enable them to withstand rough In the socket-die is a falsebottom or movusage; and the object of the invention is to able disk L,which is held a little above the provide a means for condensing andhardentrue bottom L of said dieby means of springs ing the bottomportion, especially of such ar- .9, which are seated in recesses g, madein the o ticles where said bottom portion has been bottom and disk or ineither. These springs formed from pulp material. .9 have considerablepower, but not enough to In the accompanying drawings, the letter Aresist the force of the press, this bottom piece designates the base ofthe press, which is proor disk having a diameter about equal to or avided with a follower B, which, in the conlittle less than that of theinterior chamber 35 struction illustrated, is designed to be operof thesocket-die at its lower portion, and on ated by hydraulic pressure, suchas is ordiits upper face conforms to the desired shape narilyemployedinhydraulicpresses, although of the pail-bottom. Owing to the amount ofother power may be used. pressure employed, as hereinafter referred to,

O designates the piston-socket in the base, the pail-form will stick oradhere to the'walls e 40 and D the piston-column carrying the folof thechamber, and it is evident that such lower. The pipe which conveys thewater into adherence will be greatest at the sides of the and from thesocket O is indicated at d. A chamber. For this reason the springs arearsuitable distance above the base is the pressranged toward the marginof the disk or false head E, from which projects downward the bottom, orcircumferentially, as shown, in or- 5 5 hollow male die F, having thecontour of the der that they may exert their lifting force interior ofthe pail and illustrated in the form at the points where the greatestadherence of a 'frustum of a cone. The upper portion of occurs. the maledie is reduced annnlarly, as shown, The side wall of the socket-die isrecessed forming a shoulder a. On this shoulder, and or chambered, asindicated at N, and commu 50 of less thickness than the height of therenicating with this recess or chamber are the duced portion, rests anannular dischargesteam supply and exhaust pipes 11 and a,

which serve for heatingthe die. These pipes are designed to be providedwith flexible portions m and m, whereby the socket-die is al lowedmotion back and forth to facilitate feeding the paihform to the pressand discharging the same after pressure.

The operation is as follows: The pail-form indicated at P havingbeen'dampened', is fed into the socket-die, which is drawn forward onthe truck for this purpose. Said truck is then moved back with saidsocket-die under the male die and the follower is caused to rise withsaid socket-die, which is centered automatically by the action of theupper die as it becomes inserted into the socket-die. A pressure ofseveral tons is exerted, and the follower is thenlowered, allowing thesocketdie to descend. The spring-bottom of the latter pressing the pailupward, loosens it from the socket-die, so that it can be readilyremoved therefrom. Through the bottom of the socket-die is provided anaperture for the admission of air and to allow the false bottom to bereached if it should become fast or fail in its upward movement.

The spring ring or annulus on the upper die is designed to pressdownward against the upper edge of the pail, in order to loosen it fromsaid upper die in case it should tend to adhere thereto.

The object of the hot press is to give the pail firmness and solidity,especially condensing and hardening its bottom portion.

. nation, with the male die, of a female die provided with a yieldingsupport and having chambered side walls, a perforated bottom, and aspring-supported false bottom resting upon said perforated bottom,substantially as specified.

3. In a press for hollow vessels, the combination, with the follower andthe socket-die, of the track supported on the follower and thespring-truck carrying said socket-die, substantially as described.

, In testimony whereof we affix our signatures in presence of twowitnesses.

UZAL HULL. NVILLIAM \V. MCElVAN.

lVitnesses:

ISRAEL HARRIS, MADISEN RAISLEY.

